Flat bag air tightness detection device and detection method

Abstract

The present application discloses a device and method for detecting air tightness of a flat bag, which relates to the technical field of flat bags, including: a conveyor belt, a heat seal, a surplus control component, a layering component, and a detection component. The conveyor belt is continuously arranged with multiple groups to form a transmission line for transmitting flat bags. Starting from the upstream of the transmission line, the heat seal, the surplus control component, the layering component and the detection component are sequentially arranged on the conveyor belt; the heat seal processes a heat seal line and an easy-tear line on the flat bag, the flat bag passes through the surplus control component to be layered in the layering component, and then the air tightness is detected by the detection component; further, a device and method for detecting the sealing of the flat bag through subsequent printing and dyeing traces are provided, so that the whole process is simple and fast without affecting the processing efficiency of the flat bag, and the subsequent detection method is also simple.

Description

Technical Field

[0001] The present application relates to the technical field of flat bags, and in particular to a flat bag air tightness detection device and a detection method. Background Art

[0002] Flat bags, also known as flat bags, are generally used for industrial packaging and are widely used in hardware, plastics, toys, crafts, electronics, clothing, accessories, materials, chemicals, textiles and other fields. Flat bags of various materials can be designed and produced according to customer requirements. They are the most produced and used plastic bags. PE is the most used in the production and customization of flat bags. PE flat bags are soft to the touch and have a certain degree of transparency. They can be used repeatedly. They are hygienic, non-toxic, environmentally friendly, moisture-proof, waterproof, dust-proof and mildew-proof. They are the most popular raw material for flat bags among merchants.

[0003] Before the flat bags are put on the market, the air tightness of the flat bags needs to be tested. The existing air tightness of flat bags is mostly tested manually, which is very wasteful of manpower and inefficient, and it is easy to cause errors during the testing process.

[0004] Therefore, it is necessary to provide a flat bag air tightness detection device and a detection method to solve the problems raised in the above background technology. Summary of the invention

[0005] To achieve the above purpose, the present application provides the following technical solution: a flat bag air tightness detection device, comprising:

[0006] A conveyor belt, a heat sealer, a surplus control component, a layering component, and a detection component, wherein the conveyor belt is continuously arranged in multiple groups to form a conveyor line for conveying flat bags, starting from the upstream of the conveyor line, the heat sealer, the surplus control component, the layering component, and the detection component are sequentially arranged on the conveyor belt, and the surplus control component is arranged between two groups of the conveyor belts;

[0007] The heat sealing element processes a heat sealing line and an easy-tear line on the flat bag, and the flat bag passes through the surplus control component to be layered in the layering component, and then passes through the detection component to perform air tightness detection;

[0008] The layered assembly comprises a separation shaft and a lower pressing shaft, the two separation shafts are arranged horizontally in parallel, the lower pressing shaft is arranged in parallel at a position slightly above the middle of the two separation shafts, and the flat bag passes between the separation shaft and the lower pressing shaft;

[0009] The detection component includes an exhaust arc rod and an adjustment plate. The adjustment plate adjusts the position of the exhaust arc rod fixed on the conveyor belt and adjusts the distance between the exhaust arc rod and the conveyor belt. A plurality of exhaust ports are arranged on the exhaust arc rod, and a dyeing structure is arranged at the position of the exhaust port.

[0010] Furthermore, as a preference, a flattening roller is provided on the conveyor belt at an upstream position of the heat-sealing element for adjusting the flat state of the flat bag when it passes through the heat-sealing element, and a check wheel group is provided on the conveyor belt at a downstream position of the detection component, the check wheel group consists of two synchronously rotating rollers, and the distance between the rollers in the check wheel group is adjustable.

[0011] Further, as a preference, the heat sealing component comprises a heat sealer and a cutter, the heat sealer is used to process a heat sealing line on the flat bag, the cutter is used to process a tear line on the flat bag, and the heat sealer and the cutter are kept at a distance from each other to facilitate forming a bottom opening between the tear line and the heat sealing line.

[0012] Further, preferably, along the direction from downstream to upstream of the transmission line, the easy-tear line, the bottom opening and the heat-sealing line of the flat bag are arranged in sequence.

[0013] Further, preferably, the surplus control assembly includes a driving wheel set, a passive wheel set, a movable shaft and a spring base, the flat bag passes through the inside of the driving wheel set and the passive wheel set, and the flat bag bypasses above the movable shaft.

[0014] Further, preferably, the distance between the two separation shafts is smaller than the diameter of the lower pressure shaft, the two separation shafts are driven by independent motors, and the synchronous deflection is controlled by a controller; the lower pressure shaft is driven by a sliding element to move up and down.

[0015] Further, preferably, a friction strip is provided on the separation shaft, the length of the friction strip is less than one quarter of the circumference of the outer surface of the separation shaft, and the deflection range of the separation shaft ensures that the line connecting the axis of the separation shaft and the axis of the lower pressure shaft always passes through the friction strip.

[0016] Further, preferably, the layered component is layered at the bottom.

[0017] A method for detecting air tightness of a flat bag comprises the following steps:

[0018] Ⅰ. The flat bag is continuously transported on the conveyor belt and is heat-sealed and cut by the heat-sealing parts. A heat-sealing line and an easy-tear line are processed on the flat bag, and a bottom is formed between the easy-tear line and the heat-sealing line;

[0019] Ⅱ. At the position of the layered component, the bottom of the flat bag is layered, and the flat bag is squeezed by the lower pressure shaft pressing down and fitting the separation shaft, and then the separation shaft rotates in different directions, thereby driving the lower film of the flat bag to separate from the upper film, and the lower film is processed with an indentation, and then the lower pressure shaft and the separation shaft are reset, and the flat bag is layered at the bottom, so that a gap is formed inside the bottom of the flat bag to contain gas;

[0020] Ⅲ. The gas in the flat bag is discharged through the exhaust arc rod. During the exhaust process, the exhaust arc rod presses the flat bag tightly, and presses the tear line and the heat sealing line in turn to complete the extrusion of the bottom opening, so that the gas in the bottom opening is only discharged through the exhaust port position. The sealing of the heat sealing line is detected by observing whether there are printing and dyeing marks on the bottom opening.

[0021] Compared with the prior art, the present application provides a flat bag air tightness detection device and detection method, which has the following beneficial effects:

[0022] In the present application, the exhaust arc rod presses the flat bag, and presses over the tear line and the heat sealing line in turn to complete the squeezing of the bottom opening, so that the gas in the bottom opening is discharged only through the exhaust port position, and the sealing of the heat sealing line is detected by observing whether there are printing and dyeing marks caused by the exhaust port on the bottom opening. The entire detection process is followed by heat sealing and cutting. Subsequent unqualified flat bags can be torn open at the tear line and discharged, which does not affect the entire processing flow and is simple to identify the sealing. In addition, the presence of printing and dyeing marks at the bottom opening does not affect the overall appearance of the flat bag. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Other features, objects and advantages of the present application will become more apparent by reading the detailed description of non-limiting embodiments with reference to the following drawings:

[0024] Figure 1 It is a schematic diagram of the overall structure of a flat bag air tightness detection device;

[0025] Figure 2 A schematic diagram of the structure of a residual control component of a flat bag air tightness detection device;

[0026] Figure 3 A schematic diagram of the working principle of a residual control component of a flat bag air tightness detection device;

[0027] Figure 4 A schematic diagram of the layered component structure of a flat bag air tightness testing device;

[0028] Figure 5 A schematic diagram of the working principle of the layered components of a flat bag air tightness testing device;

[0029] Figure 6 A schematic diagram of the structure of a flat bag after layering treatment of a flat bag air tightness testing device;

[0030] In the figure: 1. conveyor belt; 2. flattening roller; 3. heat sealing part; 4. surplus control assembly; 41. driving wheel group; 42. passive wheel group; 43. movable shaft; 44. spring base; 5. layering assembly; 51. separation shaft; 511. friction strip; 52. lower pressure shaft; 6. detection assembly; 61. adjustment plate; 62. exhaust arc rod; 621. exhaust port; 7. non-return wheel assembly; 8. flat bag; 81. heat sealing line; 82. easy tear line; 83. bottom opening. DETAILED DESCRIPTION

[0031] See also Figure 1-6 In an embodiment of the present application, a flat bag air tightness detection device comprises: a conveyor belt 1, a heat seal 3, a surplus control component 4, a layering component 5, and a detection component 6, wherein the conveyor belt 1 is continuously arranged in multiple groups to form a transmission line for transmitting flat bags 8, starting from the upstream of the transmission line, the heat seal 3, the surplus control component 4, the layering component 5 and the detection component 6 are sequentially arranged on the conveyor belt 1, and the surplus control component 4 is arranged between two groups of the conveyor belts 1;

[0032] The heat sealing member 3 processes a heat sealing line 81 and an easy-tear line 82 on the flat bag 8. The flat bag 8 passes through the remaining quantity control component 4 and is layered in the layering component 5. Then, the flat bag is tested for air tightness by the detection component 6.

[0033] The layering assembly 5 includes a separation shaft 51 and a lower pressure shaft 52. The two separation shafts 51 are arranged horizontally in parallel, and the lower pressure shaft 52 is arranged in parallel at a position slightly above the middle of the two separation shafts 51. The flat bag 8 passes between the separation shaft 51 and the lower pressure shaft 52. Specifically, the flat bag 8 is layered by moving the lower pressure shaft 52 up and down and rotating the separation shaft 51, so that a gap is formed inside the flat bag 8 to contain gas.

[0034] The detection component 6 includes an exhaust arc rod 62 and an adjustment plate 61. The adjustment plate 61 adjusts the position of the exhaust arc rod 62 fixed on the conveyor belt 1, and adjusts the distance between the exhaust arc rod 62 and the conveyor belt 1. A plurality of exhaust ports 621 are arranged on the exhaust arc rod 62, and a dyeing structure is arranged at the position of the exhaust port 621. Specifically, the gas in the flat bag 8 is discharged through the exhaust arc rod 62. During the exhaust process, the exhaust arc rod 62 presses the cross-section of the flat bag 8 to limit the internal gas of the flat bag 8 to be discharged only through the exhaust port 621. Correspondingly, if the flat bag 8 does not leak and the air pressure inside the flat bag 8 is sufficient, after exhaust, the surface of the flat bag 8 will have printing and dyeing marks left by the dyeing structure.

[0035] In this embodiment, Figure 1A flattening roller 2 is provided on the conveyor belt 1 at the upstream position of the heat-sealing component 3 for adjusting the flat state of the flat bag 8 when passing through the heat-sealing component 3. A non-return wheel group 7 is provided on the conveyor belt 1 at the downstream position of the detection component 6. The non-return wheel group 7 consists of two synchronously rotating rollers, and the distance between the rollers in the non-return wheel group 7 is adjustable.

[0036] As a preferred embodiment, the heat sealing member 3 includes a heat sealer and a cutter, the heat sealer is used to process a heat sealing line 81 on the flat bag 8, and the cutter is used to process an easy-tear line 82 on the flat bag 8, and the heat sealer and the cutter maintain a distance between them to facilitate the formation of a bottom opening 83 between the easy-tear line 82 and the heat sealing line 81.

[0037] As a preferred embodiment, along the direction from downstream to upstream of the transmission line, the easy-tear line 82, the bottom opening 83 and the heat-sealing line 81 of the flat bag 8 are arranged in sequence.

[0038] In this embodiment, Figure 2 The surplus control assembly 4 includes a driving wheel group 41, a passive wheel group 42, a movable shaft 43 and a spring base 44. The flat bag 8 passes through the driving wheel group 41 and the passive wheel group 42, and the flat bag 8 bypasses the movable shaft 43. Specifically, the flat bag 8 that has completed heat sealing and cutting is transported through the driving wheel group 41. The movable shaft 43 is fixed on the spring base 44. The movable shaft 43 rises and falls following the compression and stretching of the spring base 44, thereby adjusting the tightness of the flat bag 8.

[0039] It needs to be explained that when the flat bag 8 is layered through the layering component 5, the pulling force applied to the flat bag 8 is adjusted through the movable shaft 43, and at the same time, the transportation of the entire flat bag 8 is restricted by the non-return wheel group 7 and the driving wheel group 41. At the same time, when the flat bag 8 is pulled, it is raised and lowered through the movable shaft 43 to release or recycle the flat bag 8, thereby ensuring a constant tension of the flat bag 8 and preventing the flat bag 8 from becoming loose and wrinkled or being torn at the tear line 82.

[0040] In addition, when the single-layer membrane of the flat bag 8 is pulled in the stratification component 5 and the detection component 6, the force will be synchronously transmitted to the passive wheel group 42, that is, the single-layer membrane of the flat bag 8 is pulled, and the double-layer membrane will move synchronously at the passive wheel group 42 to avoid stratification of the flat bag 8.

[0041] As a preferred embodiment, the distance between the two separation shafts 51 is smaller than the shaft diameter of the lower pressure shaft 52, the two separation shafts 51 are driven by independent motors, and the synchronous deflection is controlled by a controller; the lower pressure shaft 52 is driven by a sliding element to move up and down, and the specific sliding element can be a combination of a slider, a slide groove and a hydraulic rod.

[0042] As a preferred embodiment, a friction strip 511 is provided on the separation shaft 51, and the length of the friction strip 511 is less than one quarter of the circumference of the outer surface of the separation shaft 51. The deflection range of the separation shaft 51 ensures that the line connecting the axis of the separation shaft 51 and the axis of the lower pressure shaft 52 always passes through the friction strip 511.

[0043] As a preferred embodiment, the stratification component 5 is stratified at the bottom opening 83, which can effectively control the printing and dyeing marks left by the detection component 6 on the flat bag 8 to remain on the bottom opening 83, avoiding damage to the surface quality of the flat bag 8. At the same time, the bottom opening 83 has a smaller length and the detection is faster.

[0044] It should be explained that the flat bag 8 is made to fit the separation axis 51 by moving the lower pressing shaft 52 downward, and then the separation axis 51 is controlled to deflect so that the lower layer of the bottom opening 83 is separated from the upper layer, and a crease is processed on the lower layer of the bottom opening 83 to avoid re-fitting.

[0045] A method for detecting air tightness of a flat bag comprises the following steps:

[0046] Ⅰ. The flat bag 8 is continuously transported on the conveyor belt 1 and is heat-sealed and cut by the heat-sealing member 3. A heat-sealing line 81 and an easy-tear line 82 are processed on the flat bag 8, and a bottom opening 83 is formed between the easy-tear line 82 and the heat-sealing line 81;

[0047] II. At the position of the layering component 5, the bottom opening 83 of the flat bag 8 is layered, and the flat bag 8 is squeezed by the lower pressing shaft 52 pressing down and fitting the separation shaft 51, and then the separation shaft 51 rotates in different directions, thereby driving the lower film of the flat bag 8 to separate from the upper film, and the lower film is processed with an indentation, and then the lower pressing shaft 52 and the separation shaft 51 are reset, and the flat bag 8 is layered at the bottom opening 83, so that a gap is formed inside the bottom opening 83 of the flat bag 8 to contain gas;

[0048] III. The gas in the flat bag 8 is discharged through the exhaust arc rod 62. During the exhaust process, the exhaust arc rod 62 presses the flat bag 8, and presses the tear line 82 and the heat sealing line 81 in sequence to complete the extrusion of the bottom opening 83, so that the gas in the bottom opening 83 is only discharged through the exhaust port 621. The sealing performance of the heat sealing line 81 is detected by observing whether there are printing and dyeing marks on the bottom opening 83.

[0049] What has been described above is only a preferred specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can make equivalent substitutions or changes within the technical scope disclosed in the present application according to the technical solution and application concept of the present application, which should be covered by the protection scope of the present application.

Claims

1. A flat bag air tightness detection device, characterized in that: include: A conveyor belt (1), a heat-sealing element (3), a residual quantity control component (4), a layering component (5), and a detection component (6), wherein the conveyor belt (1) is continuously arranged in multiple groups to form a conveyor line for conveying flat bags (8), and starting from the upstream of the conveyor line, the heat-sealing element (3), the residual quantity control component (4), the layering component (5), and the detection component (6) are sequentially arranged on the conveyor belt (1), and the residual quantity control component (4) is arranged between two groups of the conveyor belts (1); The heat sealing element (3) processes a heat sealing line (81) and an easy-tear line (82) on the flat bag (8); the flat bag (8) passes through the remaining quantity control component (4) and is layered in the layering component (5), and then is tested for air tightness by the testing component (6); The layered assembly (5) comprises a separation shaft (51) and a lower pressing shaft (52), the two separation shafts (51) are arranged horizontally in parallel, the lower pressing shaft (52) is arranged in parallel at a position slightly above the middle of the two separation shafts (51), and the flat bag (8) passes between the separation shaft (51) and the lower pressing shaft (52); The detection component (6) comprises an exhaust arc rod (62) and an adjustment plate (61), wherein the adjustment plate (61) adjusts the position of the exhaust arc rod (62) fixed on the conveyor belt (1), and adjusts the distance between the exhaust arc rod (62) and the conveyor belt (1), and a plurality of exhaust ports (621) are provided on the exhaust arc rod (62), and a dyeing structure is provided at the position of the exhaust port (621); The residual quantity control assembly (4) comprises a driving wheel group (41), a passive wheel group (42), a movable shaft (43) and a spring base (44); the flat bag (8) passes through the inside of the driving wheel group (41) and the passive wheel group (42), and the flat bag (8) passes over the movable shaft (43); The distance between the two separation shafts (51) is smaller than the diameter of the lower pressing shaft (52); the two separation shafts (51) are driven by independent motors and are controlled to deflect synchronously by a controller; the lower pressing shaft (52) is driven by a sliding element to move up and down; The separation shaft (51) is provided with a friction strip (511), the length of the friction strip (511) is less than one quarter of the circumference of the outer surface of the separation shaft (51), and the deflection range of the separation shaft (51) ensures that the line connecting the axis of the separation shaft (51) and the axis of the lower pressure shaft (52) always passes through the friction strip (511).

2. The flat bag air tightness detection device according to claim 1, characterized in that: A flattening roller (2) is provided on the conveyor belt (1) at a position upstream of the heat-sealing component (3) for adjusting the flat state of the flat bag (8) when passing through the heat-sealing component (3); a check wheel assembly (7) is provided on the conveyor belt (1) at a position downstream of the detection component (6); the check wheel assembly (7) is composed of two synchronously rotating rollers, and the spacing between the rollers in the check wheel assembly (7) is adjustable.

3. The flat bag air tightness detection device according to claim 1, characterized in that: The heat sealer (3) comprises a heat sealer and a cutter, wherein the heat sealer is used to process a heat seal line (81) on the flat bag (8), and the cutter is used to process an easy-tear line (82) on the flat bag (8), and the heat sealer and the cutter are spaced apart from each other to facilitate forming a bottom opening (83) between the easy-tear line (82) and the heat seal line (81).

4. The flat bag air tightness detection device according to claim 3, characterized in that: Along the direction from downstream to upstream of the transmission line, the easy-tear line (82), the bottom opening (83) and the heat-sealing line (81) of the flat bag (8) are arranged in sequence.

5. The flat bag air tightness detection device according to claim 4, characterized in that: The layered component (5) is layered at the bottom opening (83).

6. A method for detecting air tightness of a flat bag, using the air tightness detection device for a flat bag as claimed in any one of claims 3 to 5, characterized in that: The steps include: Ⅰ. The flat bag (8) is continuously transported on the conveyor belt (1) and is heat-sealed and cut by the heat-sealing element (3). A heat-sealing line (81) and an easy-tear line (82) are processed on the flat bag (8), and a bottom opening (83) is formed between the easy-tear line (82) and the heat-sealing line (81); II. At the position of the layering component (5), the bottom opening (83) of the flat bag (8) is layered, and the flat bag (8) is squeezed by the lower pressing shaft (52) pressing down and fitting the separation shaft (51), and then the separation shaft (51) rotates in different directions, thereby driving the lower film of the flat bag (8) to separate from the upper film, and processing the lower film with an indentation, and then the lower pressing shaft (52) and the separation shaft (51) are reset, and the layering of the flat bag (8) is completed at the bottom opening (83), so that a gap is formed inside the bottom opening (83) of the flat bag (8) to contain gas; III. The gas in the flat bag (8) is discharged through the exhaust arc rod (62). During the exhaust process, the exhaust arc rod (62) presses the flat bag (8) tightly, and sequentially presses the easy tear line (82) and the heat sealing line (81) to complete the squeezing of the bottom opening (83), so that the gas in the bottom opening (83) is discharged only through the exhaust port (621). The sealing performance of the heat sealing line (81) is detected by observing whether there are printing and dyeing marks on the bottom opening (83).

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